syzbot


WARNING in sys_pivot_root

Status: auto-obsoleted due to no activity on 2024/04/08 19:29
Subsystems: ntfs3
[Documentation on labels]
Reported-by: syzbot+a76a065ad30c6ddea4a1@syzkaller.appspotmail.com
First crash: 270d, last: 198d
Cause bisection: introduced by (bisect log) [merge commit]:
commit 6b6dc4f40c5264556223ba94693f20d83796ab1f
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date: Sun Sep 5 17:50:12 2021 +0000

  Merge tag 'mtd/for-5.15' of git://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux

Crash: WARNING in pivot_root (log)
Repro: syz .config
  
Fix bisection: the issue occurs on the latest tested release (bisect log)
  
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [ntfs3?] WARNING in sys_pivot_root 0 (1) 2023/10/24 10:02
Last patch testing requests (1)
Created Duration User Patch Repo Result
2023/11/03 12:40 31m retest repro upstream OK log
Fix bisection attempts (3)
Created Duration User Patch Repo Result
2024/03/19 14:26 2h08m bisect fix upstream OK (0) job log
2023/12/30 17:19 2h09m bisect fix upstream OK (0) job log log
2023/11/27 22:16 2h24m bisect fix upstream OK (0) job log log

Sample crash report:
------------[ cut here ]------------
DEBUG_RWSEMS_WARN_ON((rwsem_owner(sem) != current) && !rwsem_test_oflags(sem, RWSEM_NONSPINNABLE)): count = 0x0, magic = 0xffff888066862f70, owner = 0x0, curr 0xffff88807d629dc0, list empty
WARNING: CPU: 1 PID: 9840 at kernel/locking/rwsem.c:1370 __up_write kernel/locking/rwsem.c:1369 [inline]
WARNING: CPU: 1 PID: 9840 at kernel/locking/rwsem.c:1370 up_write+0x4f4/0x580 kernel/locking/rwsem.c:1626
Modules linked in:
CPU: 1 PID: 9840 Comm: syz-executor.5 Not tainted 6.6.0-rc6-syzkaller-00182-gce55c22ec8b2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
RIP: 0010:__up_write kernel/locking/rwsem.c:1369 [inline]
RIP: 0010:up_write+0x4f4/0x580 kernel/locking/rwsem.c:1626
Code: 48 c7 c7 a0 98 0a 8b 48 c7 c6 e0 9a 0a 8b 48 8b 54 24 28 48 8b 4c 24 18 4d 89 e0 4c 8b 4c 24 30 53 e8 e0 e9 e7 ff 48 83 c4 08 <0f> 0b e9 75 fd ff ff 48 c7 c1 90 dd 99 8e 80 e1 07 80 c1 03 38 c1
RSP: 0018:ffffc9000b3ffca0 EFLAGS: 00010296
RAX: da70038a13777500 RBX: ffffffff8b0a9980 RCX: ffff88807d629dc0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000b3ffd70 R08: ffffffff81543302 R09: 1ffff9200167fee8
R10: dffffc0000000000 R11: fffff5200167fee9 R12: 0000000000000000
R13: ffff888066862f70 R14: 1ffff9200167ff9c R15: dffffc0000000000
FS:  00007f0d80dfe6c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6ea5934000 CR3: 0000000073a48000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 inode_unlock include/linux/fs.h:807 [inline]
 unlock_mount fs/namespace.c:2508 [inline]
 __do_sys_pivot_root fs/namespace.c:4252 [inline]
 __se_sys_pivot_root+0x591/0x1650 fs/namespace.c:4166
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f0d81a7cae9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f0d80dfe0c8 EFLAGS: 00000246 ORIG_RAX: 000000000000009b
RAX: ffffffffffffffda RBX: 00007f0d81b9c050 RCX: 00007f0d81a7cae9
RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000020000000
RBP: 00007f0d81ac847a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f0d81b9c050 R15: 00007ffdbee6f518
 </TASK>

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/10/20 09:56 upstream ce55c22ec8b2 a42250d2 .config console log report syz [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs WARNING in sys_pivot_root
* Struck through repros no longer work on HEAD.